The feedback link changed in the sense on the new models there is no need for the counter bore for the swashplate link. It gave more clamping power for loads that were put together with the servo arm. But now the bore is not needed anymore, instead they changed the servo arm.
You will be able to get the old feedback link as service parts.
The side cover insert improved by way of the chemical compounds that go into making the steel that helps with wear and tear on the part. You will no longer be able to get the old side cover insert.
If you need further assistance with these parts, call us at 662-871-8403 or 800-361-0068
tupelohydraulics@gmail.com